/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package fun.sssdnsy.activiti;

import cn.hutool.core.util.ObjectUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import fun.sssdnsy.common.constant.ActConstant;
import fun.sssdnsy.annotation.RepeatSubmit;
import fun.sssdnsy.core.controller.BaseController;
import fun.sssdnsy.core.domain.AjaxResult;
import fun.sssdnsy.exception.ServiceException;
import lombok.RequiredArgsConstructor;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;
import fun.sssdnsy.utils.WorkFlowUtils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;

/**
 * @author Tijs Rademakers
 */
@RestController
@RequiredArgsConstructor
public class ModelSaveRestResource extends BaseController implements ModelDataJsonConstants {

    protected static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

    private final RepositoryService repositoryService;

    private final ObjectMapper objectMapper;

    @RepeatSubmit
    @RequestMapping(value = "/model/newModel", method = RequestMethod.POST)
    public AjaxResult add(@RequestBody Map<String, Object> modelData) {
        try {
            int    version     = 0;
            String key         = modelData.get("key").toString();
            String name        = modelData.get("name").toString();
            String description = "";
            if (modelData.containsKey("description")) {
                description = modelData.get("description").toString();
            }

            Model checkModel = repositoryService.createModelQuery().modelKey(key).singleResult();
            if (ObjectUtil.isNotNull(checkModel)) {
                return AjaxResult.error("模型key已存在", null);
            }
            // 1. 初始空的模型
            Model model = repositoryService.newModel();
            model.setKey(key);
            model.setName(name);
            model.setVersion(version);

            // 封装模型json对象
            ObjectNode objectNode = objectMapper.createObjectNode();
            objectNode.put(ModelDataJsonConstants.MODEL_NAME, name);
            objectNode.put(ModelDataJsonConstants.MODEL_REVISION, version);
            objectNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, description);
            model.setMetaInfo(objectNode.toString());
            // 保存初始化的模型基本信息数据
            repositoryService.saveModel(model);

            // 封装模型对象基础数据json串
            // {"id":"canvas","resourceId":"canvas","stencilset":{"namespace":"http://b3mn.org/stencilset/bpmn2.0#"},"properties":{"process_id":"未定义"}}
            ObjectNode editorNode     = objectMapper.createObjectNode();
            ObjectNode stencilSetNode = objectMapper.createObjectNode();
            stencilSetNode.put("namespace", ActConstant.NAMESPACE);
            editorNode.replace("stencilset", stencilSetNode);
            // 标识key
            ObjectNode propertiesNode = objectMapper.createObjectNode();
            propertiesNode.put("process_id", key);
            propertiesNode.put("name", name);
            editorNode.replace("properties", propertiesNode);
            repositoryService.addModelEditorSource(model.getId(), editorNode.toString().getBytes(StandardCharsets.UTF_8));
        } catch (Exception e) {
            e.printStackTrace();
            throw new ServiceException(e.getMessage());
        }
        return AjaxResult.success();
    }

    /**
     * @Description: 编辑模型
     * @param: modelId
     * @param: values
     * @return: void
     * @author: gssong
     * @Date: 2022/8/8
     */
    @RequestMapping(value = "/model/{modelId}/save", method = RequestMethod.PUT)
    @ResponseStatus(value = HttpStatus.OK)
    public void saveModel(@PathVariable String modelId, @RequestParam MultiValueMap<String, String> values) {
        try {

            Model model = repositoryService.getModel(modelId);

            ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());

            modelJson.put(MODEL_NAME, values.getFirst("name"));
            modelJson.put(MODEL_DESCRIPTION, values.getFirst("description"));
            model.setMetaInfo(modelJson.toString());
            model.setName(values.getFirst("name"));
            model.setVersion(model.getVersion() + 1); // 每次保存把版本更新+1
            // 获取唯一标识key
            String key = objectMapper.readTree(values.getFirst("json_xml")).get("properties").get("process_id").textValue();
            model.setKey(key);


            repositoryService.saveModel(model);
            byte[] xmlBytes = WorkFlowUtils.bpmnJsonToXmlBytes(values.getFirst("json_xml").getBytes(StandardCharsets.UTF_8));

            repositoryService.addModelEditorSource(model.getId(), xmlBytes);

            InputStream     svgStream = new ByteArrayInputStream(values.getFirst("svg_xml").getBytes(StandardCharsets.UTF_8));
            TranscoderInput input     = new TranscoderInput(svgStream);

            PNGTranscoder transcoder = new PNGTranscoder();
            // Setup output
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            TranscoderOutput      output    = new TranscoderOutput(outStream);

            // Do the transformation
            transcoder.transcode(input, output);
            final byte[] result = outStream.toByteArray();
            repositoryService.addModelEditorSourceExtra(model.getId(), result);
            outStream.close();

        } catch (Exception e) {
            LOGGER.error("Error saving model", e);
            throw new ActivitiException("Error saving model", e);
        }
    }
}
